MCD10132 Rev. 1.1, 21-Jun-10 Page 1 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Applications
Intermediate Bus Architectures
Distributed Power Architectures
Data communications
Telecommunications
Servers, workstations
Benefits
High efficiency – no heat sink required
Reduces total solution board area
Tape and reel packing
Compatible with pick &place equipment
Minimizes part numbers in inventory
Low cost
Member of the Family
Features
RoHS lead free and lead-solder-exempted products
are available
Delivers up to 5 A (28 W)
Extended input range 9.6 V – 14 V
No derating up to 85 C (70 °C for 5V and 3.3V)
Surface-mount package
Industry-standard footprint and pinout
Small size and low profile: 0.80” x 0.45” x 0.247”
(20.32 x 11.43 x 6.27mm)
Weight: 0.079 oz [2.26 g]
Co-planarity < 0.003"
Synchronous Buck Converter topology
Start-up into pre-biased output
No minimum load required
Programmable output voltage via external resistor
Operating ambient temperature: -40 °C to 85 °C
Remote ON/OFF
Fixed frequency operation
Auto-reset output overcurrent protection
Auto-reset overtemperature protection
High reliability, MTBF approx. 71.8 Million Hours
calculated per Telcordia TR-332, Method I Case 1
All materials meet UL94, V-0 flammability rating
UL 60950 recognition in U.S. & Canada, and
DEMKO certification per IEC/EN 60950
Description
Power-One’s point-of-load converters are recommended for use with regulated bus converters in an Intermediate
Bus Architecture (IBA). The YM12S05 non-isolated DC-DC converters deliver up to 5A of output current in an
industry-standard surface-mount package. Operating from a 9.6-14 VDC input, the YM12S05 converters are ideal
choices for Intermediate Bus Architectures where Point-of-Load power (POL) delivery is generally a requirement.
They provide an extremely tight regulated programmable output voltage of 0.7525 V to 5.5 V.
The Y-Series converters provide exceptional thermal performance, even in high temperature environments with
minimal airflow. No derating is required up to 85 C (up to 70 C for 5 V and 3.3 V outputs), even without airflow at
natural convection. This is accomplished through the use of advanced circuitry, packaging and processing
techniques to achieve a design possessing ultra-high efficiency, excellent thermal management and a very low
body profile.
The low body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing
cooling for both upstream and downstream devices. The use of 100% automation for assembly, coupled with
advanced power electronics and thermal design, results in a product with extremely high reliability.
MCD10132 Rev. 1.1, 21-Jun-10 Page 2 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Electrical Specifications
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=12VDC, Vout = 0.7525 - 5.5V, unless otherwise specified.
Parameter Notes Min Typ Max Units
Absolute Maximum Ratings
Input Voltage Continuous -0.3 15 VDC
Operating Ambient Temperature -40 85 °C
Storage Temperature -55 125 °C
Feature Characteristics
Switching Frequency 310 kHz
Output Voltage Trim Range1 By external resistor, See Trim Table 1 0.7525 5.5 VDC
Turn-On Delay Time Full resistive load
With Vin = (Converter Enabled, then
Vin applied) From Vin = Vin(min) to Vo=0.1* Vo(nom) 7.5 ms
With Enable (Vin = Vin(nom) applied,
then enabled) From enable to Vo= 0.1*Vo(nom) 7.5 ms
Rise time (Full resistive load) From 0.1*Vo(nom) to 0.9*Vo(nom) 7 ms
ON/OFF Control 2
Converter Off 2.4 Vin VDC
Converter On -5 0.8 VDC
Additional Notes:
1. The output voltage should not exceed 5.5V.
2. The converter is on if the ON/OFF pin is left open.
MCD10132 Rev. 1.1, 21-Jun-10 Page 3 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Electrical Specifications (continued)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=12VDC, Vout = 0.7525 - 5.5V, unless otherwise specified.
Parameter Notes Min Typ Max Units
Input Characteristics
Operating Input Voltage Range 9.6 12 14 VDC
Input Under Voltage Lockout
Turn-on Threshold 9.0 VDC
Turn-off Threshold 8.8 VDC
Maximum Input Current 5 ADC Out @ 9.6 VDC In
VOUT = 5.0 VDC 2.9 ADC
VOUT = 3.3 VDC 2.0 ADC
V
OUT = 2.5 VDC 1.6 ADC
V
OUT = 2.0 VDC 1.4 ADC
V
OUT = 1.8 VDC 1.25 ADC
V
OUT = 1.5 VDC 1.0 ADC
V
OUT = 1.2 VDC 0.8 ADC
V
OUT = 1.0 VDC 0.7 ADC
Input Stand-by Current (Converter disabled) 1 mA
Input No Load Current (Converter enabled) VOUT = 5.0 VDC 65 mA
VOUT = 3.3 VDC 47 mA
VOUT = 2.5 VDC 35 mA
VOUT = 2.0 VDC 28 mA
VOUT = 1.8 VDC 25 mA
VOUT = 1.5 VDC 20 mA
VOUT = 1.2 VDC 17 mA
VOUT = 1.0 VDC 15 mA
Input Reflected-Ripple Current -
i
s See Fig. D for setup. (BW=20MHz)
VOUT = 5.0 VDC 55 mAP-P
VOUT = 3.3 VDC 48 mAP-P
VOUT = 2.5 VDC 43 mAP-P
VOUT = 2.0 VDC 38 mAP-P
VOUT = 1.8 VDC 35 mAP-P
VOUT = 1.5 VDC 32 mAP-P
VOUT = 1.2 VDC 28 mAP-P
VOUT = 1.0 VDC 25 mAP-P
Input Voltage Ripple Rejection 120Hz 72 dB
MCD10132 Rev. 1.1, 21-Jun-10 Page 4 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Electrical Specifications (continued)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=12VDC, Vout = 0.7525 - 5.5V, unless otherwise specified.
Parameter Notes Min Typ Max Units
Output Characteristics
Output Voltage Set Point (no load) -1.5 Vout +1.5 %Vout
Output Regulation1
Over Line Full resistive load 1 mV
Over Load From no load to full load 0.25 %Vout
Output Voltage Range
(Over all operating input voltage, resistive load
and temperature conditions until end of life )
-2.5
+2.5
%Vout
Output Ripple and Noise - 20MHz bandwidth Over line, load and temperature (Fig. D)
Peak-to-Peak VOUT = 5.0 VDC 55 70 mVP-P
Peak-to-Peak VOUT = 0.7525 VDC 40 50 mVP-P
External Load Capacitance Plus full load (resistive)
Min ESR > 1m 1,000
F
Min ESR > 10 m 2,000
F
Output Current Range 0 5 A
Output Current Limit Inception (IOUT) 10
A
Output Short- Circuit Current Short=10 m, continuous 2 Arms
Dynamic Response
Iout step from 2.5A to 5A with di/dt = 5 A/S Co = 47 F ceramic. + 1 F ceramic 100 mV
Settling Time (VOUT < 10% peak deviation) 20 µs
Iout step from 5A to 2.5A with di/dt = -5 A/S Co = 47 F ceramic + 1 F ceramic 100 mV
Settling Time (VOUT < 10% peak deviation) 20 µs
Efficiency Full load (5A)
VOUT = 5.0 VDC 92.0 %
V
OUT = 3.3 VDC 88.5 %
V
OUT = 2.5 VDC 86.5 %
V
OUT = 2.0 VDC 84.5 %
V
OUT = 1.8 VDC 83.5 %
V
OUT = 1.5 VDC 81.5 %
V
OUT = 1.2 VDC 79.0 %
V
OUT = 1.0 VDC 76.0 %
Additional Notes:
1. Trim resistor connected across the GND and TRIM pins of the converter.
MCD10132 Rev. 1.1, 21-Jun-10 Page 5 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Operations
Input and Output Impedance
The Y-Series converter should be connected via a
low impedance to the DC power source. In many
applications, the inductance associated with the
distribution from the power source to the input of the
converter can affect the stability of the converter. It is
recommended to use decoupling capacitors
(minimum 47F) placed as close as possible to the
converter input pins in order to ensure stability of the
converter and reduce input ripple voltage. Internally,
the converter has 10F (low ESR ceramics) of input
capacitance.
In a typical application, low - ESR tantalum or POS
capacitors will be sufficient to provide adequate
ripple voltage filtering at the input of the converter.
However, very low ESR ceramic capacitors 47F-
100F are recommended at the input of the
converter in order to minimize the input ripple
voltage. They should be placed as close as possible
to the input pins of the converter.
The YM12S05 has been designed for stable
operation with no external capacitance on the output.
It is recommended to place low ESR ceramic
capacitors to minimize output ripple voltage. Low
ESR ceramic capacitors placed as close as possible
to the load are recommended for improved transient
performance and lower output voltage ripple.
It is important to keep low resistance and low
inductance PCB traces for connecting your load to
the output pins of the converter. This is required to
maintain good load regulation since the converter
does not have a SENSE pin for compensating
voltage drops associated with the power distribution
system on your PCB.
ON/OFF (Pin 1)
The ON/OFF pin (Pin 1) is used to turn the power
converter on or off remotely via a system signal that
is referenced to GND (Pin 4). The typical
connections are shown in Fig. A.
To turn the converter on the ON/OFF pin should be
at logic low or left open, and to turn the converter off
the ON/OFF pin should be at logic high or connected
to Vin.
The ON/OFF pin is internally pulled-down. A TTL or
CMOS logic gate, open collector (open drain)
transistor can be used to drive the ON/OFF pin.
When using open collector (open drain) transistor,
add a pull-up resistor (R*) of 75K to Vin as shown in
Fig. A.
Vin
CONTROL
INPUT
Vin
Vin
GND
ON/OFF
(Top View)
Converter
TRIM
Vout
R*
Rload
Y-Series
Fig. A: Circuit configuration for ON/OFF function.
This device must be capable of:
- sinking up to 0.2 mA at a low level voltage of
0.8 V
- sourcing up to 0.25 mA at a high logic level of
2.3V – 5V
- sourcing up to 0.75 mA when connected to Vin.
Output Voltage Programming (Pin 3)
The output voltage can be programmed from
0.7525V to 5.5V by connecting an external resistor
between TRIM pin (Pin 3) and GND pin (Pin 4); see
Fig. B. Note that when trim resistor is not connected,
output voltage of the converter is 0.7525V.
A trim resistor, RTRIM, for a desired output voltage
can be calculated using the following equation:
1
0.7525)- (V
5.10
R
REQ-O
RIMT [k]
where,
TRIMRRequired value of trim resistor [k]
REQOVDesired (trimmed) output voltage [V]
Vin
RTRIM
Rload
Converter
Vin
GND
ON/OFF
(Top View)
TRIM
Vout
Y-Series
Fig. B: Configuration for programming output voltage.
Note that the tolerance of a trim resistor directly
affects the output voltage tolerance. It is
recommended to use standard 1% or 0.5% resistors;
for tighter tolerance, two resistors in parallel are
recommended rather than one standard value from
Table 1.
MCD10132 Rev. 1.1, 21-Jun-10 Page 6 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ground pin of the trim resistor should be connected
directly to the converter GND pin with no voltage
drop in between. Table 1 provides the trim resistor
values for popular output voltages.
Table 1: Trim Resistor Value
V0-REG [V] RTRIM [kΩ] The Closest
Standard Value
[
kΩ
]
0.7525 open
1.0 41.42 41.2
1.2 22.46 22.6
1.5 13.05 13.0
1.8 9.02 9.09
2.0 7.42 7.50
2.5 5.01 4.99
3.3 3.12 3.09
5.0 1.47 1.47
5.5 1.21 1.21
The output voltage can be also programmed by
external voltage source. To make trimming less
sensitive, a series external resistor Rext is
recommended between TRIM pin and programming
voltage source. Control Voltage can be calculated by
the formula:
15
0.7525)- )(VR1(
7.0V REQ-OEXT
CTRL
[V]
where
CTRLVControl voltage [V]
EXTRExternal resistor between TRIM pin and
voltage source; the value can be chosen depending
on the required output voltage range [k].
Control voltages with EXTR0 and
EXTR15K are
shown in Table 2.
Table 2: Control Voltage [VDC]
V0-REG [V] VCTRL (REXT = 0) VCTRL(REXT = 15K)
0.7525 0.700 0.700
1.0 0.684 0.436
1.2 0.670 0.223
1.5 0.650 -0.097
1.8 0.630 -0.417
2.0 0.617 -0.631
2.5 0.584 -1.164
3.3 0.530 -2.017
5.0 0.417 -3.831
5.5 0.384 -4.364
Protection Features
Input Undervoltage Lockout
Input undervoltage lockout is standard with this
converter. The converter will shut down when the
input voltage drops below a pre-determined voltage;
it will start automatically when Vin returns to a
specified range.
The input voltage must be typically 9.0V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops below typically 8.8V.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent and
short circuit conditions. Upon sensing an overcurrent
condition, the converter will enter hiccup mode. Once
over-load or short circuit condition is removed, Vout
will return to nominal value.
Overtemperature Protection (OTP)
The converter will shut down under an over-
temperature condition to protect itself from
overheating caused by operation outside the thermal
derating curves, or operation in abnormal conditions
such as system fan failure. After the converter has
cooled to a safe operating temperature, it will
automatically restart.
Safety Requirements
The converter meets North American and
International safety regulatory requirements per
UL60950 and EN60950. The maximum DC voltage
between any two pins is Vin under all operating
conditions. Therefore, the unit has ELV (extra low
voltage) output; it meets SELV requirements under
the condition that all input voltages are ELV.
The converter is not internally fused. To comply with
safety agencies requirements, a recognized fuse
with a maximum rating of 7.5 Amps must be used in
series with the input line.
Characterization
General Information
The converter has been characterized for many
operational aspects, to include thermal derating
(maximum load current as a function of ambient
temperature and airflow) for vertical and horizontal
mounting, efficiency, start-up and shutdown
MCD10132 Rev. 1.1, 21-Jun-10 Page 7 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
parameters, output ripple and noise, transient
response to load step-change, overload and short
circuit.
The figures are numbered as Fig. x.y, where x
indicates the different output voltages, and y
associates with specific plots (y = 1 for the vertical
thermal derating, …). For example, Fig. x.1 will refer
to the vertical thermal derating for all the output
voltages in general.
The following pages contain specific plots or
waveforms associated with the converter. Additional
comments for specific data are provided below.
Test Conditions
All data presented were taken with the converter
soldered to a test board, specifically a 0.060” thick
printed wiring board (PWB) with four layers. The top
and bottom layers were not metalized. The two inner
layers, comprising two-ounce copper, were used to
provide traces for connectivity to the converter.
The lack of metalization on the outer layers as well
as the limited thermal connection ensured that heat
transfer from the converter to the PWB was
minimized. This provides a worst-case but consistent
scenario for thermal derating purposes.
All measurements requiring airflow were made in the
vertical and horizontal wind tunnel facilities using
Infrared (IR) thermography and thermocouples for
thermometry.
Ensuring components on the converter do not
exceed their ratings is important to maintaining high
reliability. If one anticipates operating the converter
at or close to the maximum loads specified in the
derating curves, it is prudent to check actual
operating temperatures in the application.
Thermographic imaging is preferable; if this
capability is not available, then thermocouples may
be used. . It is recommended the use of AWG #40
gauge thermocouples to ensure measurement
accuracy. Careful routing of the thermocouple leads
will further minimize measurement error. Refer to
Fig. C for optimum measuring thermocouple
locations.
Fig. C: Location of the thermocouple for thermal testing.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Figs. x.1 to x.2 for maximum
temperature of 120 °C. Ambient temperature was
varied between 25 °C and 85 °C, with airflow rates
from 30 to 500 LFM (0.15m/s to 2.5 m/s), and
vertical and horizontal converter mounting.
For each set of conditions, the maximum load
current is defined as the lowest of:
(i) The output current at which any MOSFET
temperature does not exceed a maximum specified
temperature (120°C) as indicated by the
thermographic image, or
(ii) The maximum current rating of the converter (5A)
During normal operation, derating curves with
maximum FET temperature less than or equal to
120 °C should not be exceeded. Temperature on the
PCB at the thermocouple location shown in Fig. C
should not exceed 120 °C in order to operate inside
the derating curves.
Efficiency
Figure x.3 shows the efficiency vs. load current plot
for ambient temperature of 25 ºC, airflow rate of 200
LFM (1 m/s) and input voltages of 9.6V, 12V and
14V.
Power Dissipation
Fig. x.4 shows the power dissipation vs. load current
plot for Ta = 25ºC, airflow rate of 200 LFM (1 m/s)
with vertical mounting and input voltages of 9.6V,
12V and 14V.
Ripple and Noise
The output voltage ripple waveform is measured at
full rated load current. Note that all output voltage
waveforms are measured across a 1 F ceramic
capacitor.
The output voltage ripple and input reflected ripple
current waveforms are obtained using the test setup
shown in Fig. D.
iS
Vout
Vsource
1F
ceramic
capacitor
1 H
source
inductance
DC/DC
Converter
47F
ceramic
capacitor
47F
ceramic
capacitor
CO
CIN
Y-Series
Vin
GND GND
Vout
Fig. D: Test setup for measuring input reflected ripple
currents, is and output voltage ripple.
MCD10132 Rev. 1.1, 21-Jun-10 Page 8 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 5.0V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 5.0V converter
mounted vertically with Vin = 12V, air flowing from pin 5 to
pin 1 and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Effi
c
i
ency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
14 V
12 V
9.6 V
Fig. 5.0V.3: Efficiency vs. load current and input voltage
for Vout = 5.0V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 5.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 5.0V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1
and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Power Dissipation [W]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
14 V
12 V
9.6 V
Fig. 5.0V.4: Power Loss vs. load current and input voltage
for Vout = 5.0V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
MCD10132 Rev. 1.1, 21-Jun-10 Page 9 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Fig. 5.0V.5: Turn-on transient for Vout = 5.0V with
application of Vin at full rated load current (resistive) and
47F external capacitance at Vin = 12V. Top trace: Vin
(10V/div.); Bottom trace: output voltage (1V/div.); Time
scale: 5 ms/div.
Fig. 5.0V.7: Output voltage response for Vout = 5.0V to
positive load current step change from 2.5A to 5A with
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mV/div.); Bottom trace: load current (2A/div.). Co =
47F ceramic. Time scale: 20s/div.
Fig. 5.0V.6: Output voltage ripple (10mV/div.) at full rated
load current into a resistive load with external capacitance
47F ceramic + 1F ceramic and Vin = 12V for Vout =
5.0V. Time scale: 2 s/div.
Fig. 5.0V.8: Output voltage response for Vout = 5.0V to
negative load current step change from 5A to 2.5A with
slew rate of -5A/s at Vin = 12V. Top trace: output voltage
(100mV/div.); Bottom trace: load current (2A/div.). Co =
47F ceramic. Time scale: 20s/div.
MCD10132 Rev. 1.1, 21-Jun-10 Page 10 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 3.3V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 3.3V converter
mounted vertically with Vin = 12V, air flowing from pin 5 to
pin 1 and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Effi
c
i
ency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
14 V
12 V
9.6 V
Fig. 3.3V.3: Efficiency vs. load current and input voltage
for Vout = 3.3V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 3.3V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 3.3V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1
and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Power Dissipation [W]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
14 V
12 V
9.6 V
Fig. 3.3V.4: Power Loss vs. load current and input voltage
for Vout = 3.3V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
MCD10132 Rev. 1.1, 21-Jun-10 Page 11 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Fig. 3.3V.5: Turn-on transient for Vout = 3.3V with
application of Vin = 12V at full rated load current (resistive)
and 47F external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 3.3V.7: Output voltage response for Vout = 3.3V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co =
47F ceramic. Time scale: 20 s/div.
Fig. 3.3V.6: Output voltage ripple (10mv/div) at full rated
load current into a resistive load with external capacitance
47F ceramic + 1F ceramic and Vin = 12V for Vout =
3.3V. Time scale: 2 s/div.
Fig. 3.3V.8: Output voltage response for Vout = 3.3V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47F
ceramic. Time scale: 20 s/div.
MCD10132 Rev. 1.1, 21-Jun-10 Page 12 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.5V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 2.5V converter
mounted vertically with Vin = 12V, air flowing from pin 5 to
pin 1 and maximum MOSFET temperature 120C.
Load Current [Adc]
0123456
Effi
c
i
ency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
14 V
12 V
9.6 V
Fig. 2.5V.3: Efficiency vs. load current and input voltage
for Vout = 2.5V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.5V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 2.5V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1
and maximum MOSFET temperature 120C.
Load Current [Adc]
0123456
Power Dissipation [W]
0.0
0.5
1.0
1.5
2.0
2.5
14 V
12 V
9.6 V
Fig. 2.5V.4: Power Loss vs. load current and input voltage
for Vout = 2.5V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
MCD10132 Rev. 1.1, 21-Jun-10 Page 13 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Fig. 2.5V.4: Turn-on transient for Vout = 2.5V with
application of Vin = 12V at full rated load current (resistive)
and 47F external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 2.5V.7: Output voltage response for Vout = 2.5V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co =
47F ceramic. Time scale: 20 s/div.
Fig. 2.5V.5: Output voltage ripple (10mv/div) at full rated
load current into a resistive load with external capacitance
47F ceramic + 1F ceramic and Vin = 12V for Vout =
2.5V. Time scale: 2 s/div.
Fig. 2.5V.8: Output voltage response for Vout = 2.5V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47F
ceramic. Time scale: 20 s/div.
MCD10132 Rev. 1.1, 21-Jun-10 Page 14 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.0V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 2.0V converter
mounted vertically with Vin = 12V, air flowing from pin 5 to
pin 1 and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Effi
c
i
ency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
14 V
12 V
9.6 V
Fig. 2.0V.3: Efficiency vs. load current and input voltage
for Vout = 2.0V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 2.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 2.0V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1
and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Power Dissipation [W]
0.0
0.5
1.0
1.5
2.0
2.5
14 V
12 V
9.6 V
Fig. 2.0V.4: Power Loss vs. load current and input voltage
for Vout = 2.0V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
MCD10132 Rev. 1.1, 21-Jun-10 Page 15 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Fig. 2.0V.5: Turn-on transient for Vout = 2.0V with
application of Vin = 12V at full rated load current (resistive)
and 47F external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 2.0V.7: Output voltage response for Vout = 2.0V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co =
47F ceramic. Time scale: 20 s/div.
Fig. 2.0V.6: Output voltage ripple (10mv/div) at full rated
load current into a resistive load with external capacitance
47F ceramic + 1F ceramic and Vin = 12V for Vout =
2.0V. Time scale: 2 s/div.
Fig. 2.0V.8: Output voltage response for Vout = 2.0V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47F
ceramic. Time scale: 20 s/div.
MCD10132 Rev. 1.1, 21-Jun-10 Page 16 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.8V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 1.8V converter
mounted vertically with Vin = 12V, air flowing from pin 5 to
pin 1 and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Effi
c
i
ency
0.65
0.70
0.75
0.80
0.85
0.90
0.95
14 V
12 V
9.6 V
Fig. 1.8V.3: Efficiency vs. load current and input voltage
for Vout = 1.8V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.8V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.8V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1
and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Power Dissipation [W]
0.0
0.5
1.0
1.5
2.0
2.5
14 V
12 V
9.6 V
Fig. 1.8V.4: Power Loss vs. load current and input voltage
for Vout = 1.8V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
MCD10132 Rev. 1.1, 21-Jun-10 Page 17 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Fig. 1.8V.5: Turn-on transient for Vout = 1.8V with
application of Vin = 12V at full rated load current (resistive)
and 47F external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 1.8V.7: Output voltage response for Vout = 1.8V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co =
47F ceramic. Time scale: 20 s/div.
Fig. 1.8V.6: Output voltage ripple (10mv/div) at full rated
load current into a resistive load with external capacitance
47F ceramic + 1F ceramic and Vin = 12V for Vout =
1.8V. Time scale: 2 s/div.
Fig. 1.8V.8: Output voltage response for Vout = 1.8V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47F
ceramic. Time scale: 20 s/div.
MCD10132 Rev. 1.1, 21-Jun-10 Page 18 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.5V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 1.5V converter
mounted vertically with Vin = 12V, air flowing from pin 5 to
pin 1 and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Effi
c
i
ency
0.65
0.70
0.75
0.80
0.85
0.90
14 V
12 V
9.6 V
Fig. 1.5V.3: Efficiency vs. load current and input voltage
for Vout = 1.5V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.5V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.5V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1
and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Power Dissipation [W]
0.0
0.5
1.0
1.5
2.0
14 V
12 V
9.6 V
Fig. 1.5V.4: Power Loss vs. load current and input voltage
for Vout = 1.5V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
MCD10132 Rev. 1.1, 21-Jun-10 Page 19 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Fig. 1.5V.5: Turn-on transient for Vout = 1.5V with
application of Vin = 12V at full rated load current (resistive)
and 47F external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 1.5V.7: Output voltage response for Vout = 1.5V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co =
47F ceramic. Time scale: 20 s/div.
Fig. 1.5V.6: Output voltage ripple (10mv/div) at full rated
load current into a resistive load with external capacitance
47F ceramic + 1F ceramic and Vin = 12V for Vout =
1.5V. Time scale: 2 s/div.
Fig. 1.5V.8: Output voltage response for Vout = 1.5V to a
negative load current step change from 5A to 2.5A with a
slew rate of -5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47F
ceramic. Time scale: 20 s/div.
MCD10132 Rev. 1.1, 21-Jun-10 Page 20 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.2V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 1.2V converter
mounted vertically with Vin = 12V, air flowing from pin 5 to
pin 1 and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Effi
c
i
ency
0.60
0.65
0.70
0.75
0.80
0.85
0.90
14 V
12 V
9.6 V
Fig. 1.2V.3: Efficiency vs. load current and input voltage
for Vout = 1.2V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.2V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.2V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1
and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Power Dissipation [W]
0.0
0.5
1.0
1.5
2.0
14 V
12 V
9.6 V
Fig. 1.2V.4: Power Loss vs. load current and input voltage
for Vout = 1.2V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
MCD10132 Rev. 1.1, 21-Jun-10 Page 21 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Fig. 1.2V.5: Turn-on transient for Vout = 1.2V with
application of Vin = 12V at full rated load current (resistive)
and 47F external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 1.2V.6: Output voltage response for Vout = 1.2V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co =
47F ceramic. Time scale: 20 s/div.
Fig. 1.2V.6: Output voltage ripple (10mv/div) at full rated
load current into a resistive load with external capacitance
47F ceramic + 1F ceramic and Vin = 12V for Vout =
1.2V. Time scale: 2 s/div.
Fig. 1.2V.8: Output voltage response for Vout = 1.2V to a
negative load current step change from 5A to 2.5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47F
ceramic. Time scale: 20 s/div.
MCD10132 Rev. 1.1, 21-Jun-10 Page 22 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.0V.1: Available load current vs. ambient
temperature and airflow rates for Vout = 1.0V converter
mounted vertically with Vin = 12V, air flowing from pin 5 to
pin 1 and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Effi
c
i
ency
0.60
0.65
0.70
0.75
0.80
0.85
0.90
14 V
12 V
9.6 V
Fig. 1.0V.3: Efficiency vs. load current and input voltage
for Vout = 1.0V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
1
2
3
4
5
6
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Fig. 1.0V.2: Available load current vs. ambient temperature
and airflow rates for Vout = 1.0V converter mounted
horizontally with Vin = 12V, air flowing from pin 5 to pin 1
and maximum MOSFET temperature 120 C.
Load Current [Adc]
0123456
Power Dissipation [W]
0.0
0.5
1.0
1.5
2.0
14 V
12 V
9.6 V
Fig. 1.0V.4: Power Loss vs. load current and input voltage
for Vout = 1.0V converter mounted vertically with air
flowing from pin 5 to pin 1 at a rate of 200 LFM (1 m/s) and
Ta = 25 C.
MCD10132 Rev. 1.1, 21-Jun-10 Page 23 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Fig. 1.0V.5: Turn-on transient for Vout = 1.0V with
application of Vin = 12V at full rated load current (resistive)
and 47F external capacitance. Top trace: Vin (10V/div);
Bottom trace: Vout (1V/div); Time scale: 2 ms/div.
Fig. 1.0V.7: Output voltage response for Vout = 1.0V to a
positive load current step change from 2.5A to 5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co =
47F ceramic. Time scale: 20 s/div.
Fig. 1.0V.6: Output voltage ripple (10mv/div) at full rated
load current into a resistive load with external capacitance
47F ceramic + 1F ceramic and Vin = 12V for Vout =
1.0V. Time scale: 2 s/div.
Fig. 1.0V.8: Output voltage response for Vout = 1.0V to a
negative load current step change from 5A to 2.5A with a
slew rate of 5A/s at Vin = 12V. Top trace: output voltage
(100mv/div); Bottom trace: load current (2A/div). Co = 47F
ceramic. Time scale: 20 s/div.
MCD10132 Rev. 1.1, 21-Jun-10 Page 24 of 24 www.power-one.com
YM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5A
Physical Information
SIDE VIEW
34
1
2
TOP VIEW
5
YM12S Pinout (Surface Mount)
Converter Part Numbering Scheme
Product
Series
Input
Voltage
Mounting
Scheme
Rated Load
Current
RoHS
Compatible
YM 12 S 05 G
Y-Series 9.6V – 14V
S Surface
Mount
5A
(0.7525V to 5.5V)
No Suffix RoHS
lead-solder-exempt compliant
G RoHS Compliant
The example above describes P/N YM12S05G: 9.6V – 14V input, surface mount, 5A at 0.7525V to 5.5V output, and RoHS compliant.
Please consult factory regarding availability of a specific version.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical
components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written
consent of the respective divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on
the date manufactured. Specifications are subject to change without notice.
Pad/Pin Connections
Pad/Pin # Function
1 ON/OFF
2 Vout
3 TRIM
4 GND
5 Vin
YM12S Platform Notes
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Module Weight: 0.079 oz [2.26 g]
Module Height: 0.260” Max., 0.234” Min.
Recommended Surface-Mount Pads:
Min. 0.080” X 0.112” [2.03 x 2.84]
